diff --git a/include/osmocom/msc/mncc.h b/include/osmocom/msc/mncc.h
index 881e041..49f0c8b 100644
--- a/include/osmocom/msc/mncc.h
+++ b/include/osmocom/msc/mncc.h
@@ -155,6 +155,9 @@
 	int		notify; /* 0..127 */
 	int		emergency;
 	char		imsi[16];
+
+	unsigned char	lchan_type;
+	unsigned char	lchan_mode;
 };
 
 struct gsm_data_frame {
@@ -176,6 +179,7 @@
 	uint32_t	called_offset;
 	uint32_t	signal_offset;
 	uint32_t	emergency_offset;
+	uint32_t	lchan_type_offset;
 };
 
 struct gsm_mncc_rtp {